Electromagnetic switch



June 16, 1925. 1,542,768

A. J. HEITZ ELECTROMAGNETIC SWITCH Filed March 26. 1924 INVENTOR.

Alberfilfleiiz, 43 V A TTORNE Y.

Patented June 16, 1925.

mam or mammal-1111mm.

Application nicd'ilaich 26,1924. Serial No. 702,074.

To all whom it may concern:

Be it'kndwn that I, ALBERT J. Hnrrz, a citizen of the United States, residing at Vinceffines, infthe county of'Knox and State of Indiana, have invented certain new and useful Improvements in Electromagnetic Switches, of which the following is a speci- "fication. p

c iThis invention relates to an electromagnetic switch for an electric lamp fixture, moreparticularl to a switch employed in connection with amps in multiple for use in stores, banking rooms, 'ofiices, 'etc., but it is to be understood that an electro-magnetic switch 'in accordance with this invention can be employed for any purposes for which it is found applicable,:and the "inventionhasc forits object to f0 h, a fixture of the class referred to, having means whereby one of the lamps of the multiple will be active emu times forthe purpose of illuminating the interior of a store room, banking room, etc., su'fiiciently to enable a pedestrian, policeman orwatchman= to view the interior thereof atall times to discover the presence of a surreptitious or unauthoriied person, fire, leakage of steam and water plpes, or when theappearance of such interior is not normal which would cause the observer to conclude that somethin is'wrong. c c

A flirt er object of the invention is to rovide, in a manner as hereinafter set orth, an electromagnetic switch for use in connection with two or more lamps and including an automatically operable li hting circuit directing meansprovided fort e initial lighting of one of the lamps only, butwill automatically operate to cutintothecircuit of a secondlamp in the event of the burningout of the active lamp, whereby there is obtained a continuous lighting of an interior with an aggregate of assurance and certainty. c I

:Further objects of the invention are to provide, in a manner as hereinafter set forth, an electro-magnetio switch for the purpose referred to, which is simple-in its construction and arrangement, strong, durable, thoroughly efficient in itsuse, readily installed, conveniently assembled, and comparatively inexpensive to manufacture. I

-Withthe foregoingand other ob ects 1n viewythe invention comists o'ftthe novel construction, combination and-arrangement of this invention.

rovide, in .a manner aslhelcina'fter set parts, as hereinafter more specifically I "described and illustrated in theaccompanying drawings, wherein is'shown an embodiment 5f th invention, butit is'to beun'der$ that changes, variations 1 and modifications "can, be resorted to which come within the Scope of the claims (hereunto appended.

In the drawings wherein like reference characters denote corresponding parts throughout the several views igurelfis a vertical sectional view df an electro magnetic switch in accordance with Figure 2 is, a section on "line 22,*Figure 1, looki'n' gin the directionof the arrows.

' Figure 3' is 'a fragmentary view in section. Figure 4is a section on line 4-4, 'Fi gure"3. v

Figure 5 is a perspecti've view of the yoke orming an element of'the lighting circuit controlling or directingdevice.

cFigure' 6 is'a vertical sectional view of a disposed metallic yoke consisting of atop bar 2, a bottom bar3 and an en'd'bar 4. Preferably, the bars 2, 3 are of greater length than the'bar 4, and the" latter intermediate its ends is formed with an opening '5. The bar 2, as well astheQbar 3, is bifurcated at one end, whereby each of said bars has such'end formed with 'a,, pair offur'caftions 6, 7. The bar 4,-ateach end, isformed with a tongue 8, which snugly engages'between the fur-cations 6 and 7 of a bar 2 or 3. The outerface of the bar 4 is flush with the edge at the bifurcated end of each of the bars 201' 3. The bar 3', intermediate its ends,

is formed with an opening 9, having 'a threaded wall, and the bar3, intermediate itsends, is provided with a counter-sunk opening 9, having its wall smooth throughout. The bar 2, as well as the bar 3, at the end thereof opposite its bifurcated end, is

providedwithan opening- 11.

The-magnet lis seated between the bars 2, 3, and is spaced a substantial distance from thebar 21. Each ,end of the core 12 of the magnetl is reduced, as at 13, andexthrough an opening "11 and is furthermore swaged against the outer face of a bar 2 or 3, as at 14, whereby the magnet is fixedly secured to the bars 2, 3. The reduced ends 13 of the core snugly engage the openings 11 and by connecting a magnet 1 to the yoke in the manner as stated it overcomes the necessity of threading the walls of the openings 11 and the employment of screws for securing the magnet in position with respect to the yoke,

The wall of the opening 5, in the bar 1, is threaded, and threadedly engaging with said wall is the threaded end terminal portion 15 of a pivot 16 provided with a head 18. The pivot 16 projects towards the magnet and has loosely mounted thereon a rectangular armature 19, which associates with the magnet. The head 18 of the pivot 16 is countersunk in the armature 19, as at 20, whereby the armature 19 is retained on the pivot 16.

Surrounding the pivot 16 is a fiat spiral spring 21, having one end thereof, as at 22, connected to the pivot 16 and its other end as at 23 connected to the armature 19. The spring 21 is arranged against that face of the armature 19 which opposes the bar 1. The function of the spring 21 is to shift the armature 19 from vertical position. The armature 19 is moved to vertical position when the magnet 1 is energized. lVhen the magnet 1 is ale-energized, the spring 21 acting on the armature 19 will cause the latter to assume the position shown in Figure 4;, for a purpose to be presently referred to.

Referring to Figures 1 and 2 of the drawings, the fixture includes a base 2 1i of insulation, provided with an extension 25 constituting a plug. Connected to the edge of the base 2%; is a casing or dome which has its body portion corresponding in contour to the contour of the base 24, and as shown by way of example the body portion 26 of the casing or dome is rectangular in contour. The body portion 26 projects from the base 251- and the height thereof is materially greater than the height of said base. The body portion 26 is formed with an outwardly extending continuous flange 27 which terminates in an integral closure 28 for said body portion 26, and the said closure 28 is of greater length and of greater *idth than the length and width of the body portion and further is offset with respect to the latter. The closure 28 is of the same material as the,body portion 26 and is forn'ied with a pair of oppositely extending inclined portions 29, 30. The portion 29 has an opening 31, and the portion 30 is formed with an opening 32.

Secured to the portion 29, as well as extending through the opening 31, is a bushing of insulation, and secured to the portion 30 as well as extending through the opening 32 is a bushing of insulation 34.

The bushing 33 is of a different color with respect to the bushing 3i, and the color of the bushing 33 is such as to indicate that it associates with the initially lighted lamp and by reference to such bushing one can tell if the lamp with which the bushing is associated is active, that it is the initially lighted lamp.

The wall of the opening formed in the bushing 33 is threaded and engaging there with and extending into the body portion 26 is a threaded metallic shell 35, having a circuit wire conncetion 36 atttached to the inner end thereof, and said connection 36 extends into the plug 25 and has electrical contact with a threaded shell 37, mounted on the plug 25 and formed with an inwardly extending annular flange The shell receives the socket of the initially li hted lamp 10, and as the bushing is disposed at an inclination with respect to the body portion 26, the shell will extend in a like manner and the lamp 40 will be disposed at an inclination.

The bushing 34 has the wall of its opening threaded and engaging therewith is a metallic shell 41 which extends into the body portion 26 and has electrically attached to its inner end a circuit wire connection 37 which is also electrically connected to the shell 37. The shell -11 provides means for connecting the socket 42 of a lamp 43 of the multiple with the casing, and the lamp a3 is disposed at an opposite inclination with respect to the lamp 40.

The yoke to which the magnet is attached is fixedly secured against the base 24 through the medium of a contact element consisting of a substantially elongated stem 44:, having its outer end provided with a fiat head 45 and its inner end threaded, as at d6, which engages with the threaded wall of the opening 9 in the bar 2 of the yoke. The stem 44 extends axially of the plug 25 and base and the head 15 abuts against the outer end of the plug 25.

Extending through the opening 10 in the bar is a bolt 46, having its head countersunk in the inner end of said opening 7. The bolt 46 projects a sutlicient distance from the bar 3 and is inclosed throughout by a sleeve 47 of insulation. Mounted, on the sleeve 47, exteriorly of the bar 3, are insulated disks 48, i9 and 50. The disk 4-8 abuts against the bar 3, and interposed between said disk 18 and disk 4-9 is one end of a contact member 51. Intcrposed between the disks 4-9 and 50 is one end of a contactmember 52. The contact members 51, 52 extend in opposite directions with respect to each other. Mounted on the threaded end of the bolt 46 is a securing nut 54 which abuts against the outer end of the sleeve 47 and the disk 50 whereby the elements 47, 48, 19, 50, 51 and 52 are clamped int) ill).

againstthe bar 3. The contact 51 has its free end in electrical engagement with the plug 39 of the lamp 40, and the contact 52 as its free end in electrical engagement with the plug 42 of the lamp 43. The contact 52 is formed with an extension 55 arranged in the path of the armature 19 when the latter is actuated or shifted through the mediumof the spring 21, whereby the armature 19 will engage the contact 55 and close the lighting circuit to the lamp -13.

The magnet 1 is electrically connected with the contact 51 by a circuit wire 56, and the ma net 1 is also electrically connected witht 1e bar 2 by a circuitwire 57.

In the form shown in Figure 6, the base and plug, casing or dome, bushings, lamp socket contacts and the manner of securing the yoke, are similar in construction to that referred to in connection with Figure 1 and like reference characters are applied thereto. In Figure 6 the circuit wire connections 36 and 37' are not employed, but in lieu thereof a pair of oppositely extending contact pieces 58, 59, is used and each of which is secured to the base 2-l by a conducting element in the form of a stem extendin through the plug 25 and having threade engagement, as at 61, with a contact piece. The stem 60, at its outer end, has a head 62 electrically engaging with the flange 63 of a metallic shell 64 connected to the plug 24. Each contact piece is connected to a metallic lamp socket receiving shell 65. The shells 65 are of greater length than the shells 35 and 41 and each of which is formed at its inner end with an opening 66, through which extends a contact 51 or 52. Otherwise than that as stated, the construction shown in Figure 6 is the same as that shown in Figure 1.

When the lamp 41 is active, the parts are in the position as shown in Figure 1 and the lighting circuit is through the stem 44, bar 2, magnet 1, circuit connection 56, con-- tact 51, contact 67 to lamp, from lamp, plug 39, circuit connection 36, shell 37. The magnet 1 is energized and the armature 19 is in a vertical position as shown in dotted lines, Figure 1, when the lighting circuit is closed, as the magnet is in series with such lamp and its circuit connections. If the lighting circuit to the lamp 40 becomes open through any cause, such as the breaking of the filament 68, the magnet 1 is de-energized whereby the spring 21 will shift the armature 19 to contact with the projection 55. The lighting circuit will then be directed to the lamp 43 and the circuit would then bestem 44, bar 2, bar 3, pivot 16, armature 19, projection or extension 55, contact 52, contact 69 to lamp, from lamp to shell 41, circuit connection 37 to shell 37.

cated at 70, the opening in the end bar 4, at 71 and which is not threaded. The

pivot would have a drive or press fit,

and is in the formofa rivet. The bar 3 of the yoke has depending therefrom a rivet 72, in lieu of a threaded bolt, and its lower end 73 is upset to clamp the elements 48 to 50 thereon, as well as a washer 74, which is interposed between the element 50 and the upset lower end 73 of the rivet 72.

Although the switch is illustrated for employment in connection with two. lamps, yet it is to be understood that the number of'lamps can be increased, but a three lamp switch would contain two magnetic devices, four lamp switchthree magnetic devices, therefore the switch can be set up with as many lamps as desired.

It is thought that the many advantages of a multiple electro-magnetic switch in accordance with this invention can be readily understood, and although the preferred embodiment of the invention is as illustrated and described, yet changes in the details of construction can be had which will fall within the light of the invention as claimed.

What I claim is 1. A switch for an electric lamp fixture comprising a metallic yoke, a magnet secured within said yoke at the open end thereof, a spring controlled armature arranged within the yoke and supported from the closed end thereof, a plurality of oppositely disposed independent contacts supported and insulated from said yoke and circuit forming connections coacting with one of said contacts for closing a circuit and energizing said magnet, and circuit forming connections coacting with another of said contacts and with said armature for closing a circuit when said magnet is deenergized.

2. A switch for an electric lamp fixture comprising a metallic yoke, means adapted to communicate with an electric source for securing said yoke in a stationary position, a magnet fixedly secured within the open end of the yoke, a spring controlled armas ture arranged within the yoke and supported from the closed end thereof, a plurality of independent contacts supported and insulated from said yoke circuit forming connections coacting with one of said contacts for closing a circuit for energizing said magnet, and circuit forming connections coacting with another of said contacts and with said armature for closing a circuit when the magnet is de-energized.

3. A switch for an electric lamp fixture comprising a supporting means, a metallic yoke within said means, a magnet secured within the open end of said yoke, a spring controlled armature arranged within said. yoke and supported from the closed end thereof, a plurality of contacts arranged exteriorly of the yoke, means for insulating said contacts from each other, means for securing said contacts and insulating means to said yoke, circuit forming means coacting with one of said contacts for energizing said magnet, and circuit forming means coacting with another of said contacts and the said armature when said mag net is de-energized.

4. A switch for an electric lamp fixture comprising a supporting means, a metallic yoke within said means, a magnet secured within the open end of said yoke, a spring controlled armature arranged within said yoke and supported from the closed end thereof, a plurality of contacts arranged exteriorly of the yoke, means for insulating said contacts from each other, means for securing said contacts and insulating means to said yoke, circuit forming means coacting with one of said contacts for energizing said magnet, and circuit forming means coacting with another of said contacts and the said armature when said magnet is deenergized. said last mentioned contact provided with a projection extending in the path of the armature when the magnet is tie-energized and the armature shifted by its controlling spring.

In testimony whereof, I afiix my signature hereto.

ALBERT J. HEITZ. 

